Experts have highlighted that celery soft rot is caused by the bacterium *Carrinocarpus rot*. This pathogen primarily resides in fields or composts and overwinters in the soil. Under favorable environmental conditions, it spreads through rainwater, irrigation water, and insect vectors such as the yellow striped triceratops and cabbage caterpillars. The bacteria enter plants through natural cracks, mechanical wounds, or insect damage on the roots, then move into the vascular system, multiplying and causing the first infection, which can lead to secondary infections. In addition to celery, this disease can affect a wide range of crops, including carrots, cucumbers, radishes, Chinese cabbage, and more than 20 other vegetables and fruits.
The symptoms of celery soft rot mainly appear at the base of the petioles. Infected areas initially show water-soaked spots that gradually expand into brown, spindle-shaped or irregularly shaped lesions. During dry periods, the disease tends to stop spreading, but under high humidity, it progresses rapidly. The affected tissues become wet and soft, with the internal parts decaying while only the epidermis remains. A foul odor is often emitted from the infected areas.
To effectively manage celery soft rot, an integrated approach combining agricultural practices and chemical control is recommended. This includes selecting resistant varieties, improving cultivation techniques, and applying appropriate fungicides for better results.
First, crop rotation is essential. It's advisable to avoid planting celery alongside cruciferous vegetables or other susceptible crops in consecutive seasons. Rotating with non-host crops for 2–3 years helps reduce pathogen buildup in the soil and improves soil health by allowing the land to rest. This also promotes the decomposition of diseased plant material and reduces the survival of pathogens.
Second, proper field management plays a key role. Deep furrow cultivation, timely drainage after rainfall, and careful water management can lower the risk of bacterial spread. Applying well-composted organic fertilizer and maintaining balanced nutrition help strengthen plant resistance. Careful handling during field operations is crucial to prevent mechanical injuries that could serve as entry points for pathogens.
Third, thorough sanitation is necessary. As soon as diseased plants are detected, they should be removed and treated immediately. Watering both the infected and surrounding healthy plants can help reduce the spread of the disease. After harvest, all plant debris must be cleared from the field and either buried or burned to prevent further contamination. Soil should be deeply tilled to accelerate the breakdown of infected material.
Fourth, chemical control measures are effective when applied early. Spraying should begin at the first sign of infection, with applications every 7–10 days for 2–3 times. Recommended products include 47% Garethon WP diluted 600–800 times (125–165 grams per acre), 72.2% Precise diluted 1000 times (100 grams per acre), Amine Wettable Powder at 800 times (125 grams per acre), 30% DT Wettable Powder at 600 times (165 grams per acre), and 50% Doxamine Water at 800–1000 times (100–125 grams per acre). In severe cases, foliar sprays can also be used to prevent further spread.
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